Mono CODEC. WM8974 Datasheet

WM8974 CODEC. Datasheet pdf. Equivalent

Part WM8974
Description Mono CODEC
Feature WM8974 Mono CODEC with Speaker Driver DESCRIPTION The WM8974 is a low power, high quality mono COD.
Manufacture Cirrus Logic
Datasheet
Download WM8974 Datasheet



WM8974
WM8974
Mono CODEC with Speaker Driver
DESCRIPTION
The WM8974 is a low power, high quality mono CODEC
designed for portable applications such as Digital Still Camera
or Digital Voice Recorder.
The device integrates support for a differential or single ended
mic, and includes drivers for speakers or headphone, and
mono line output. External component requirements are
reduced as no separate microphone or headphone amplifiers
are required.
Advanced Sigma Delta Converters are used along with digital
decimation and interpolation filters to give high quality audio at
sample rates from 8 to 48ks/s. Additional digital filtering
options are available in the ADC path, to cater for application
filtering such as ‘wind noise reduction’, plus an advanced
mixed signal ALC function with noise gate is provided. The
digital audio interface supports A-law and -law companding.
An on-chip PLL is provided to generate the required Master
Clock from an external reference clock. The PLL clock can
also be output if required elsewhere in the system.
The WM8974 operates at supply voltages from 2.5 to 3.6V,
although the digital supplies can operate at voltages down to
1.71V to save power. The speaker and mono outputs use a
separate supply of up to 5V which enables increased output
power if required. Different sections of the chip can also be
powered down under software control by way of the selectable
two or three wire control interface.
WM8974 is supplied in a very small 4x4mm QFN package,
offering high levels of functionality in minimum board area, with
high thermal performance.
DCVDD DBVDD DGND
WM8974
FEATURES
Mono CODEC:
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 48ks/s)
ADC SNR 94dB, THD -83dB (‘A’-weighted @ 8 48ks/s)
On-chip Headphone/Speaker Driver with ‘cap-less’ connect
- 40mW output power into 16/ 3.3V SPKVDD
- BTL speaker drive 0.9W into 8/ 5V SPKVDD
Additional MONO Line output
Multiple analogue or ‘Aux’ inputs, plus analogue bypass path
Mic Preamps:
Differential or single end Microphone Interface
- Programmable preamp gain
- Psuedo-differential inputs with common mode rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
OTHER FEATURES
5 band EQ (record or playback path)
Digital Playback Limiter
Programmable ADC High-Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
On-chip PLL
Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
- power consumption <10mA all-on 48ks/s mode
4x4x0.9mm 24 lead QFN package
APPLICATIONS
Digital Still Camera Audio CODEC
Wireless VoIP and other communication handsets / headsets
Portable audio recorder
General Purpose low power audio CODEC
AUX
analog
inputs
20k
20k
SPKGND SPKVDD
NOISY
GND
MICN
Mic
MICP
Rbias
Gains:
-12dB to +35.25dB
IP PGA
IP BOOST/MIX
ADC
ADC
DIGITAL
FILTERS
Volume
5 Band EQ
Limiter / ALC
Wind Noise
Filter
DAC
DIGITAL
FILTERS
Volume
5 Band EQ
Digital Limiter
Notch Filter
DAC
0dB,
-10dB
BYPASS
0dB,
-10dB
MICBIAS
50k 50k
4k 5k 500k 500k
PLL
I2S or PCM
INTERFACE
A-law and u-law support
CONTROL
INTERFACE
MONOOUT
-1
SPKR PGA
SPKOUTP
L - (-R)
= L+R
SPKOUTN
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20042016
(All Rights Reserved)
Rev 4.7
AUG ‘16



WM8974
WM8974
TABLE OF CONTENTS
DESCRIPTION....................................................................................................... 1
FEATURES ............................................................................................................ 1
APPLICATIONS..................................................................................................... 1
TABLE OF CONTENTS......................................................................................... 2
PIN CONFIGURATION .......................................................................................... 3
ORDERING INFORMATION.................................................................................. 3
PIN DESCRIPTION................................................................................................ 4
ABSOLUTE MAXIMUM RATINGS ........................................................................ 5
RECOMMENDED OPERATING CONDITIONS..................................................... 5
ELECTRICAL CHARACTERISTICS ..................................................................... 6
TERMINOLOGY ............................................................................................................... 8
SIGNAL TIMING REQUIREMENTS ...................................................................... 9
SYSTEM CLOCK TIMING................................................................................................ 9
AUDIO INTERFACE TIMING MASTER MODE ............................................................ 9
AUDIO INTERFACE TIMING SLAVE MODE.............................................................. 10
CONTROL INTERFACE TIMING 3-WIRE MODE....................................................... 11
CONTROL INTERFACE TIMING 2-WIRE MODE....................................................... 12
DEVICE DESCRIPTION ...................................................................................... 13
INTRODUCTION ............................................................................................................ 13
INPUT SIGNAL PATH .................................................................................................... 14
ANALOGUE TO DIGITAL CONVERTER (ADC) ............................................................ 19
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) ............................................ 23
OUTPUT SIGNAL PATH ................................................................................................ 35
ANALOGUE OUTPUTS ................................................................................................. 42
OUTPUT SWITCH ......................................................................................................... 47
DIGITAL AUDIO INTERFACES ..................................................................................... 49
AUDIO SAMPLE RATES................................................................................................ 54
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ................................................. 55
GENERAL PURPOSE INPUT/OUTPUT ........................................................................ 57
CONTROL INTERFACE................................................................................................. 57
RESETTING THE CHIP ................................................................................................. 59
POWER SUPPLIES ....................................................................................................... 59
POWER MANAGEMENT ............................................................................................... 63
REGISTER MAP .................................................................................................. 65
REGISTER BITS BY ADDRESS .................................................................................... 66
DIGITAL FILTER CHARACTERISTICS .............................................................. 78
TERMINOLOGY ............................................................................................................. 78
DAC FILTER RESPONSES ........................................................................................... 79
ADC FILTER RESPONSES ........................................................................................... 79
DE-EMPHASIS FILTER RESPONSES .......................................................................... 80
HIGH-PASS FILTER ...................................................................................................... 81
5-BAND EQUALISER..................................................................................................... 82
APPLICATIONS INFORMATION ........................................................................ 86
RECOMMENDED EXTERNAL COMPONENTS ............................................................ 86
PACKAGE DIAGRAM ......................................................................................... 87
IMPORTANT NOTICE ......................................................................................... 88
REVISION HISTORY ........................................................................................... 89
2 Rev 4.7





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